CN104456612A - Air preheater - Google Patents
Air preheater Download PDFInfo
- Publication number
- CN104456612A CN104456612A CN201410773426.0A CN201410773426A CN104456612A CN 104456612 A CN104456612 A CN 104456612A CN 201410773426 A CN201410773426 A CN 201410773426A CN 104456612 A CN104456612 A CN 104456612A
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- CN
- China
- Prior art keywords
- heat exchange
- air
- flue gas
- air preheater
- fuse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Air Supply (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention provides an air preheater. The air preheater comprises a flue gas pipeline, an air pipeline and a heat exchanger, wherein the heat exchanger is provided with heat exchanging walls and an air flow channel; the air flow channel is formed by the heat exchanging walls; a catalyst coating is arranged on the surface of each heat exchanging wall; and nitrogen oxide can be subjected to catalytic reduction by the catalyst coatings. The air preheater is a necessary component of a power station boiler, the catalyst coatings coat the inner surfaces of the heat exchanging walls of the preheater, when flue gas flows through the air preheater, NOx in the flue gas is catalyzed and is reduced to N2, the surface of the preheater is utilized sufficiently, and the NOx is discharged as little as possible under the condition that the existing system is not modified greatly.
Description
Technical field
The present invention relates to thermal power generating technology field, particularly a kind of air preheater.
Background technology
Nitrogen oxide (the NO that power boiler burning produces
x) be one of major part forming atmosphere pollution, there is the main component that various reaction also becomes haze in atmosphere after its discharge.For reducing NO
xdischarge, polygamy of newly building a power station puts spray ammonia equipment, utilizes spray ammonia to operate in the flue gas produced to burning and sprays ammonia (NH
3), utilize the catalytic action of catalyst to make NH
3and NO
xthere is redox reaction and form nitrogen (N
2); In order to pursue denitration effect, ammonia spraying amount is often excessive, makes unnecessary NH
3escape and form new pollution.
In some built power plant, do not consider spray ammonia equipment is installed in design and construction process.As need environmental protection upgrading be carried out, need consider how reasonably to be added in flue gas emission by spray ammonia equipment, and consider boiler place space constraint; And the installation of spray ammonia equipment needs to suspend boiler operatiopn, stops not unit, causes greater loss.
Summary of the invention
The present invention, according to the Equipments Setting situation of existing generating plant flue gas exhaust system, by utilizing air preheater and flue gas to have feature compared with large contact surface, provides a kind of air preheater of painting catalyst.
The invention provides a kind of air preheater, comprise flue gas pipeline, air pipe line and heat exchanger, the gas channel having heat exchange wall in described heat exchanger and formed by heat exchange wall, described heat exchange wall surface has catalyst coat, and described catalyst coat can catalyzing and reducing nitrogen oxides.
Air preheater is the parts of station boiler indispensability, by the heat exchange wall inner surface painting catalyst coating at its preheater, at flue gas by the NO in catalyst flue gas during air preheater
x, be reduced to N
2, take full advantage of the surface of preheater, achieve NO not changing in existing system situation very much
xas far as possible few discharge.
Preferably, described heat exchange wall is the heat exchange wall of regular hexagon structure, and described gas channel is orthohexagonal gas channel.
Because regular hexagon shape can provide maximum surface area in same volume, adopt regular hexagon can be coated with catalyst as much as possible.
Preferably, described heat exchanger is for having heat exchange fuse, flue gas district and air zone; Described heat exchange wall is positioned on described heat exchange fuse, and described heat exchange fuse is crossed dragging motor driving and rotated around rotation central axis; Described flue gas district is communicated with described flue gas pipeline, and air pipe line described in described air section is communicated with; Described heat exchange fuse completes exchange heat by described flue gas district and described air zone.
Preferably, the circumferencial direction of described heat exchange fuse has driven gear, and described dragging motor drives described heat exchange fuse to rotate by gear drive.
Preferably, the heat exchange fuse of described heat exchanger is loop configuration, and described heat exchange fuse is connected with described rotation central axis by reinforcement.
Preferably, also comprise transition region, described transition region isolates described flue gas district and described air zone.
Preferably, also comprise sealing device, described sealing device seals the join domain of described flue gas pipeline and described air pipe line and described heat exchanger.
Preferably, described heat exchange wall is welded by corrosion resistant plate and is formed.
Preferably, described heat exchanger is vertically arranged, the gas approach of described flue gas pipeline upper, exhanst gas outlet under; The air intlet of described air pipe line under, air outlet slit is upper.
Accompanying drawing explanation
Fig. 1 is the front view of air preheater in embodiment;
Fig. 2 is the top view of the air preheater in embodiment;
Fig. 3 is A-A schematic cross-section in Fig. 1.
Detailed description of the invention
For making those skilled in the art better understand technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the front view of air heat exchanger in embodiment, and the air preheater from Fig. 1 in the present embodiment mainly comprises heat exchanger 1, flue gas pipeline 2 and air pipe line 3.Wherein heat exchanger 1 is vertically arranged, and the fixing axis 13 of heat exchange fuse 11 wherein around centre horizontally rotates; The gas approach 21 of flue gas pipeline 2 upper, exhanst gas outlet 22 under, flue gas flows from top to bottom; The air intlet 31 of air pipe line 3 under, air outlet slit 32 is upper, and air flows from bottom to up.The two achieves heat exchange by heat exchange fuse 11.Certainly, heat exchange fuse 11 also can be other orientation and arranges, and air intlet 31, the air outlet slit 32 also relative set of the gas approach 21 of flue gas pipeline 2, exhanst gas outlet 22 and air pipe line 2, realize heat exchange function through heat exchange fuse 11.Consideration flue gas is high-temperature gas, air is cryogenic gas, and after heat exchange, smoke settlement, air rise, and is beneficial to subsequent thermal and exchanges, and therefore preferably adopts the structure in the present embodiment.
Heat exchanger in the present embodiment comprises heat exchange fuse 11, is positioned at the passive tooth bar 12 revolved outside heart fuse 11, and drag driving gear 6 when dragging motor 5 rotates and rotate, driving gear 6 and passive tooth bar 12 engage, and drives heat exchange fuse 11 to rotate.Certainly, in other embodiments, dragging motor can be arranged on fixing axis 13 place, fix axis 13 by fixed drive and drive heat exchange fuse 11 to rotate.
Fig. 2 is the top view of the air preheater in embodiment.The heat exchange fuse 11 of the heat exchanger as can be seen from Figure 2 in the present embodiment is circular ring.In order to support heat exchange fuse 11, in the middle of fixing axis 13 and heat exchange fuse 11, there is reinforcement.Certainly, from heat exchange principle, heat exchange fuse also can make cylindrical structural, and direct and fixing axis 13 is connected.
The gas channel 112 that there is in heat exchange fuse 11 orthohexagonal heat exchange wall 111 and isolated by heat exchange wall 111.Gas channel 112 is for difference conducting flue gas pipeline 2 and air pipe line 3.On the surface of heat exchange wall 111, also there is catalyst coat 113, the NO of the catalyst catalyzes reduction flue gas in air guide channel 112 in catalyst coat 113
x, make it become N
2and be expelled to air subsequently.It should be noted that heat exchange wall 111 also can be other shapes, being designed to regular hexagon in the present embodiment is consider that it has larger surface area and good supporting role.
The Core Feature of the air preheater in the present embodiment is for adding hot-air, and it is rotated by heat exchange fuse 11 and the heat absorption heat release function of heat exchange wall 111 that heat conducts to air from flue gas.Heat exchange fuse is in rotation status always, and its part at flue gas pipeline 2 is flue gas district 15, is air zone 14 in the part of air pipe line 3.Because flue-gas temperature is greater than the temperature of heat exchange wall 111, heat exchange wall 111 absorbs heat in flue gas district 15, simultaneously by the catalyst NO in the catalyst layer 113 on surface
xbe reduced to N
2; When the heat exchange wall 111 absorbed heat rotates to air zone 14, because air themperature is less than heat exchange wall 111 temperature, heat exchange wall 111 heat release conducts to air, makes atmosphere temperature rising.In the present embodiment, between flue gas district 15 and air zone 14, also there is transition region 16, certainly, principle, also transition region 16 can not be set.
During for ensureing that air heater adds hot-air, flue gas and air can not leak from heat exchanger section, are also provided with sealing device in the periphery of heat exchanger 1 and flue gas pipeline 2, air pipe line 3 coupling part and heat exchanger 1 in the present embodiment.Obviously, this sealing device is not the assembly that the present embodiment realizes Core Feature.
Fig. 3 is A-A schematic cross-section in Fig. 1.The heat exchange fuse 11 can more clearly found out intuitively the present embodiment from Fig. 3 is annular, and its heat exchange wall 111 is regular hexagon structure.For ensureing not by corrosion in enough intensity and practical process, the heat exchange fuse in the present embodiment adopts corrosion resistant plate to make, and by welding procedure, corrosion resistant plate is welded as regular hexagon, and at interior external welding circular base slab.
It should be noted that the heat exchange function can understood in the present embodiment rotates heat absorption heat release realization by heat exchange fuse 11 from above describing.Consider from principle, also directly can arrange mutually isolated flue gas pipeline and air pipe line in heat exchange fuse, flue gas pipeline and air pipe line repeat to arrange, and utilize the heat conduction function of heat exchange wall that flue gas heat is conducted to air.Now, catalyst coat should be coated on the inner surface of flue gas pipeline
Air preheater in the above embodiment of the present invention is described in detail.Apply specific case herein to set forth principle of the present invention and embodiment; the explanation of above embodiment just understands core concept of the present invention for helping; without departing from the principles of the present invention; also can carry out some improvement and modification to the present invention, these improve and modify and also fall within the scope of protection of the present invention.
Claims (9)
1. an air preheater, comprise flue gas pipeline (2), air pipe line (3) and heat exchanger (1), the gas channel (112) that there is in described heat exchanger (1) heat exchange wall (111) and formed by heat exchange wall (111), it is characterized in that, described heat exchange wall (111) surface has catalyst coat (113), and described catalyst coat (113) can catalyzing and reducing nitrogen oxides.
2. air preheater according to claim 1, is characterized in that, the heat exchange wall that described heat exchange wall (111) is regular hexagon structure, and described gas channel (112) is orthohexagonal gas channel.
3. air preheater according to claim 1, is characterized in that, described heat exchanger is for having heat exchange fuse (11), flue gas district (15) and air zone (14); Described heat exchange wall (111) is positioned on described heat exchange fuse (11), and described heat exchange fuse (11) is crossed dragging motor (5) driving and rotated around rotation central axis (13); Described flue gas district (15) is communicated with described flue gas pipeline (2), and described air zone (14) described air pipe line (3) is communicated with; Described heat exchange fuse (11) completes exchange heat by described flue gas district (15) and described air zone (14).
4. air heat exchanger according to claim 3, it is characterized in that, the circumferencial direction of described heat exchange fuse (11) has passive tooth bar (12), and described dragging motor (5) drives described heat exchange fuse (11) to rotate by gear drive.
5. air preheater according to claim 3, it is characterized in that, the heat exchange fuse (11) of described heat exchanger (1) is loop configuration, and described heat exchange fuse (11) is connected with described rotation central axis (13) by reinforcement.
6. air preheater according to claim 3, is characterized in that, also comprises transition region (16), and described transition region (16) isolates described flue gas district (15) and described air zone (14).
7. air preheater according to claim 1, it is characterized in that, also comprise sealing device (7), described sealing device (7) seals the join domain of described flue gas pipeline (2) and described air pipe line (3) and described heat exchanger (1).
8. air preheater according to claim 1, is characterized in that, described heat exchange wall (111) is welded by corrosion resistant plate and formed.
9. air preheater according to claim 1, is characterized in that, described heat exchanger (11) is vertically arranged, the gas approach (21) of described flue gas pipeline (3) upper, exhanst gas outlet (22) under; The air intlet (31) of described air pipe line (2) under, air outlet slit (32) is upper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410773426.0A CN104456612A (en) | 2014-12-12 | 2014-12-12 | Air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410773426.0A CN104456612A (en) | 2014-12-12 | 2014-12-12 | Air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104456612A true CN104456612A (en) | 2015-03-25 |
Family
ID=52903096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410773426.0A Pending CN104456612A (en) | 2014-12-12 | 2014-12-12 | Air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104456612A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104906953A (en) * | 2015-06-24 | 2015-09-16 | 中国计量学院 | Denitration catalyst structure and air preheater with same |
| CN105021075A (en) * | 2015-05-26 | 2015-11-04 | 北京恩吉节能科技有限公司 | Dual-preheating rotation type heat-storage heat exchanger and combustion system |
| CN107376933A (en) * | 2017-06-23 | 2017-11-24 | 清华大学 | It is a kind of to be used to reduce catalyst metals heating surface of NOx in flue gas and preparation method thereof |
| CN107398283A (en) * | 2017-06-23 | 2017-11-28 | 清华大学 | Catalyst metals heating surface of NOx content and preparation method thereof in a kind of reduction flue gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04106396A (en) * | 1990-08-24 | 1992-04-08 | Seibu Giken:Kk | Manufacture of element for total heat exchanger |
| CN101146592A (en) * | 2005-03-24 | 2008-03-19 | 恩必安有限公司 | The system of treating odor and hazardrous gas with rotary regenerative heat exchanger and its apparatus |
| JP2010048461A (en) * | 2008-08-21 | 2010-03-04 | Seibu Giken Co Ltd | Total enthalpy heat exchanger |
| CN103994462A (en) * | 2014-06-05 | 2014-08-20 | 山东大学 | Air preheating and denitration integrated reactor and reaction method |
-
2014
- 2014-12-12 CN CN201410773426.0A patent/CN104456612A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04106396A (en) * | 1990-08-24 | 1992-04-08 | Seibu Giken:Kk | Manufacture of element for total heat exchanger |
| CN101146592A (en) * | 2005-03-24 | 2008-03-19 | 恩必安有限公司 | The system of treating odor and hazardrous gas with rotary regenerative heat exchanger and its apparatus |
| JP2010048461A (en) * | 2008-08-21 | 2010-03-04 | Seibu Giken Co Ltd | Total enthalpy heat exchanger |
| CN103994462A (en) * | 2014-06-05 | 2014-08-20 | 山东大学 | Air preheating and denitration integrated reactor and reaction method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021075A (en) * | 2015-05-26 | 2015-11-04 | 北京恩吉节能科技有限公司 | Dual-preheating rotation type heat-storage heat exchanger and combustion system |
| CN105021075B (en) * | 2015-05-26 | 2018-12-07 | 北京恩吉节能科技有限公司 | It is double to preheat rotary regenerative heat exchanger and combustion system |
| CN104906953A (en) * | 2015-06-24 | 2015-09-16 | 中国计量学院 | Denitration catalyst structure and air preheater with same |
| CN107376933A (en) * | 2017-06-23 | 2017-11-24 | 清华大学 | It is a kind of to be used to reduce catalyst metals heating surface of NOx in flue gas and preparation method thereof |
| CN107398283A (en) * | 2017-06-23 | 2017-11-28 | 清华大学 | Catalyst metals heating surface of NOx content and preparation method thereof in a kind of reduction flue gas |
| CN107398283B (en) * | 2017-06-23 | 2021-02-26 | 清华大学 | Catalyst metal heating surface for reducing NOx content in flue gas and preparation method thereof |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |
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| RJ01 | Rejection of invention patent application after publication |